[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 113.975923][ T30] audit: type=1800 audit(1565914401.021:25): pid=12795 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 114.000044][ T30] audit: type=1800 audit(1565914401.041:26): pid=12795 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 114.040474][ T30] audit: type=1800 audit(1565914401.071:27): pid=12795 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.212' (ECDSA) to the list of known hosts. 2019/08/16 00:13:34 fuzzer started 2019/08/16 00:13:40 dialing manager at 10.128.0.26:36111 2019/08/16 00:13:41 syscalls: 2376 2019/08/16 00:13:41 code coverage: enabled 2019/08/16 00:13:41 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/08/16 00:13:41 extra coverage: enabled 2019/08/16 00:13:41 setuid sandbox: enabled 2019/08/16 00:13:41 namespace sandbox: enabled 2019/08/16 00:13:41 Android sandbox: /sys/fs/selinux/policy does not exist 2019/08/16 00:13:41 fault injection: enabled 2019/08/16 00:13:41 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/08/16 00:13:41 net packet injection: enabled 2019/08/16 00:13:41 net device setup: enabled syzkaller login: [ 323.264212][ C1] ================================================================== [ 323.272369][ C1] BUG: KMSAN: uninit-value in kmem_cache_free+0x3df/0x2b70 [ 323.279599][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0-rc3+ #17 [ 323.287071][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 323.297172][ C1] Call Trace: [ 323.300582][ C1] dump_stack+0x191/0x1f0 [ 323.304965][ C1] kmsan_report+0x162/0x2d0 [ 323.309515][ C1] __msan_warning+0x75/0xe0 [ 323.314068][ C1] kmem_cache_free+0x3df/0x2b70 [ 323.319043][ C1] ? kfree_skb+0x473/0x4c0 [ 323.323495][ C1] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 323.329646][ C1] kfree_skb+0x473/0x4c0 [ 323.334062][ C1] ? packet_rcv_spkt+0x719/0x840 [ 323.339043][ C1] packet_rcv_spkt+0x719/0x840 [ 323.343861][ C1] ? packet_rcv+0x2190/0x2190 [ 323.348625][ C1] __netif_receive_skb_core+0x3aed/0x51a0 [ 323.354434][ C1] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 323.360469][ C1] netif_receive_skb_internal+0x3cc/0xc20 [ 323.366266][ C1] napi_gro_receive+0x682/0xb90 [ 323.371214][ C1] receive_buf+0x653b/0x8810 [ 323.375907][ C1] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 323.381931][ C1] virtnet_poll+0x666/0x19d0 [ 323.386598][ C1] ? refill_work+0x460/0x460 [ 323.391229][ C1] net_rx_action+0x74b/0x1950 [ 323.395987][ C1] ? net_tx_action+0xba0/0xba0 [ 323.400836][ C1] __do_softirq+0x4a1/0x83a [ 323.405409][ C1] ? ksoftirqd_should_run+0x30/0x30 [ 323.410645][ C1] ? takeover_tasklets+0x900/0x900 [ 323.415788][ C1] run_ksoftirqd+0x25/0x40 [ 323.420244][ C1] smpboot_thread_fn+0x4a3/0x990 [ 323.425242][ C1] kthread+0x4b5/0x4f0 [ 323.429340][ C1] ? cpu_report_death+0x190/0x190 [ 323.434410][ C1] ? kthread_blkcg+0xf0/0xf0 [ 323.439043][ C1] ret_from_fork+0x35/0x40 [ 323.443511][ C1] [ 323.445855][ C1] Uninit was stored to memory at: [ 323.450997][ C1] kmsan_internal_chain_origin+0xcc/0x150 [ 323.456744][ C1] __msan_chain_origin+0x6b/0xe0 [ 323.461708][ C1] ___slab_alloc+0x1dbc/0x1fb0 [ 323.466516][ C1] kmem_cache_alloc+0xade/0xd10 [ 323.471385][ C1] skb_clone+0x326/0x5d0 [ 323.475659][ C1] packet_rcv_spkt+0x245/0x840 [ 323.480449][ C1] __netif_receive_skb_core+0x3aed/0x51a0 [ 323.486221][ C1] netif_receive_skb_internal+0x3cc/0xc20 [ 323.491969][ C1] napi_gro_receive+0x682/0xb90 [ 323.496853][ C1] receive_buf+0x653b/0x8810 [ 323.501486][ C1] virtnet_poll+0x666/0x19d0 [ 323.506104][ C1] net_rx_action+0x74b/0x1950 [ 323.510809][ C1] __do_softirq+0x4a1/0x83a [ 323.515341][ C1] run_ksoftirqd+0x25/0x40 [ 323.519788][ C1] smpboot_thread_fn+0x4a3/0x990 [ 323.524752][ C1] kthread+0x4b5/0x4f0 [ 323.528849][ C1] ret_from_fork+0x35/0x40 [ 323.533371][ C1] [ 323.535727][ C1] Uninit was created at: [ 323.540014][ C1] kmsan_internal_poison_shadow+0x53/0xa0 [ 323.545766][ C1] kmsan_slab_free+0x8d/0x100 [ 323.550478][ C1] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 323.555891][ C1] __kfree_skb_flush+0xb0/0x100 [ 323.560776][ C1] net_rx_action+0x1908/0x1950 [ 323.565574][ C1] __do_softirq+0x4a1/0x83a [ 323.570120][ C1] irq_exit+0x230/0x280 [ 323.574305][ C1] do_IRQ+0x20d/0x3a0 [ 323.578312][ C1] ret_from_intr+0x0/0x33 [ 323.582655][ C1] default_idle+0x53/0x90 [ 323.587114][ C1] arch_cpu_idle+0x25/0x30 [ 323.591556][ C1] do_idle+0x1d7/0x790 [ 323.595654][ C1] cpu_startup_entry+0x45/0x50 [ 323.600484][ C1] rest_init+0x1be/0x1f0 [ 323.604783][ C1] arch_call_rest_init+0x13/0x15 [ 323.609745][ C1] start_kernel+0x991/0xb61 [ 323.614280][ C1] x86_64_start_reservations+0x18/0x2e [ 323.619766][ C1] x86_64_start_kernel+0x81/0x84 [ 323.624742][ C1] secondary_startup_64+0xa4/0xb0 [ 323.629806][ C1] ================================================================== [ 323.637896][ C1] Disabling lock debugging due to kernel taint [ 323.644070][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 323.650697][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Tainted: G B 5.3.0-rc3+ #17 [ 323.659569][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 323.671231][ C1] Call Trace: [ 323.674564][ C1] dump_stack+0x191/0x1f0 [ 323.678944][ C1] panic+0x3c9/0xc1e [ 323.682923][ C1] kmsan_report+0x2ca/0x2d0 [ 323.687550][ C1] __msan_warning+0x75/0xe0 [ 323.692085][ C1] kmem_cache_free+0x3df/0x2b70 [ 323.696967][ C1] ? kfree_skb+0x473/0x4c0 [ 323.701490][ C1] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 323.707618][ C1] kfree_skb+0x473/0x4c0 [ 323.712002][ C1] ? packet_rcv_spkt+0x719/0x840 [ 323.716971][ C1] packet_rcv_spkt+0x719/0x840 [ 323.721773][ C1] ? packet_rcv+0x2190/0x2190 [ 323.726520][ C1] __netif_receive_skb_core+0x3aed/0x51a0 [ 323.732358][ C1] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 323.738400][ C1] netif_receive_skb_internal+0x3cc/0xc20 [ 323.744192][ C1] napi_gro_receive+0x682/0xb90 [ 323.749119][ C1] receive_buf+0x653b/0x8810 [ 323.753823][ C1] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 323.759846][ C1] virtnet_poll+0x666/0x19d0 [ 323.764513][ C1] ? refill_work+0x460/0x460 [ 323.769150][ C1] net_rx_action+0x74b/0x1950 [ 323.773996][ C1] ? net_tx_action+0xba0/0xba0 [ 323.778794][ C1] __do_softirq+0x4a1/0x83a [ 323.783372][ C1] ? ksoftirqd_should_run+0x30/0x30 [ 323.788601][ C1] ? takeover_tasklets+0x900/0x900 [ 323.793714][ C1] run_ksoftirqd+0x25/0x40 [ 323.798194][ C1] smpboot_thread_fn+0x4a3/0x990 [ 323.803167][ C1] kthread+0x4b5/0x4f0 [ 323.807231][ C1] ? cpu_report_death+0x190/0x190 [ 323.812285][ C1] ? kthread_blkcg+0xf0/0xf0 [ 323.816887][ C1] ret_from_fork+0x35/0x40 [ 323.822451][ C1] Kernel Offset: disabled [ 323.826788][ C1] Rebooting in 86400 seconds..